Hyperoside-Rich Blueberry Leaf Tea Improves Sleep Continuity in Adults with Poor Sleep: A Two-Week Randomized Double-Blind Controlled Trial
Abstract
Background/objectives: Sleep is fundamental to physical and mental health, yet many individuals experience impaired sleep quality. Although pharmacological interventions are available, they are associated with risks of dependency and adverse effects, underscoring the urgent need for safer, food-based alternatives. Blueberry leaves, rich in hyperoside, are suggested to influence sleep through serotonergic and melatonergic pathways; however, while their potential to help maintain sleep quality has been noted, the sleep-enhancing effects of fermented blueberry leaf tea have not yet been demonstrated. This present randomized, double-blind, placebo-controlled trial evaluated the sleep-enhancing effects of fermented blueberry leaf tea on sleep quality.
Methods: Fifty adults (aged 20-69 years) reporting poor sleep were randomly assigned to consume either fermented blueberry leaf tea (n = 25) or placebo tea (n = 25) three times daily for two weeks. Objective sleep parameters-sleep efficiency, wake after sleep onset (WASO), sleep latency, and total sleep time-were assessed using actigraphy, while subjective sleep quality was evaluated using the Oguri-Shirakawa-Azumi Sleep Inventory MA (OSA-MA) version questionnaire.
Results: In the per-protocol analysis (active: n = 22; placebo: n = 20), the active group exhibited significant improvements in sleep efficiency and WASO compared with the placebo (p < 0.05). No significant differences were observed for sleep latency, total sleep time, or…
How strong is the evidence?
Evidence Hub reads this as a randomized trial, done in people. Its evidence level is 3 of 5 (Moderate · trial / cohort / secondary analysis). Trials without a large randomized design, cohorts and secondary analyses give moderate evidence. Reported size: 25 participants or records.
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